At his annual live call-in show late last week, Vladimir Putin wryly offered political asylum to James Comey “if he faces prosecution of any kind” in the United States, asking, “What’s the difference between the FBI director and [Edward] Snowden?” There is, of course, a clear distinction between slipping your own unclassified memo to the press and leaking a massive trove of data about classified National Security Agency programs. There’s another important difference: the latter...